p-Block Elements (Group 15–18)

The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of

1. Atomicity
2. Electron gain enthalpy
3. Atomic size
4. Electronegativity

The incorrect statement among the following is

1. PH3 shows lower proton affinity than NH3.
2. SO2 can act as an oxidizing agent, but not as a reducing agent.
3. NO2 can dimerise easily.
4. PF3 exists but NF5 does not.

The maximum covalency of a non-metallic group 15 element ' E ' with weakest E-E bond is :

1. 5
2. 3
3. 4
4. 6

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

1. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2. (A) is correct but (R) is not correct
3. (A) is not correct but (R) is correct
4. Both (A) and (R) are correct and (R) is the correct explanation of (A)

On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed?

1. Sulphur
2. Nitric oxide
3. Lead nitrate
4. Nitrous oxide

Number of oxygen atoms present in chemical formula of fuming sulphuric acid is .

Among the following halogens F2, Cl2, Br2 and I2 Which can undergo disproportionation reactions?

1. F2 and Cl2
2. Cl2, Br2 and I2
3. Only I2
4. F2, Cl2 and Br2

Identify the incorrect statements about group 15 elements : Choose the correct answer from the options given below :

1. (A), (C), (E) only
2. (D) and (E) only
3. (A), (B), (D) only
4. (B), (D), (E) only

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

1. Both (A) and (R) are correct and (R) is the correct explanation of (A)
2. (A) is not correct but (R) is correct
3. (A) is correct but (R) is not correct
4. Both (A) and (R) are correct but (R) is not the correct explanation of (A)

The strongest reducing agent among the following is :

1. SbH3
2. NH3
3. BiH3
4. PH3